I replaced mine with the Bosch 4 hole a couple weeks ago.
My thoughts:
1. I'm happy with the replacement
- I feel this is important. Some changes can result in either happiness, regret or no difference.
(ie: I bought Steelhorse chrome hoodlocks in the late '90's...and I regret doing that.)
(I should note I've ran the stock hoodlatches since)
2. Did it improve my mpg?
- yes*
* my answer has 2 caveats
2a. I think there was a very subtle leak in one of my fuel injectors, possibly just the o-ring. I had previously thought I had fuel pressure loss due to a bad anti-drain valve in my fuel pump, but upon taking out the injectors and inspecting closer, I think I had a bad fuel injector.
(meaning the fact that ANY new fuel injector/o-ring would improve my mpg, and it's not necessarily due to the 4ports)
2b. I don't accurately keep track of my mpg, so I'm just using an educated guess. I know where to expect my gas guage to be when I drive out to the cottage, and I've been seeing a visible difference. I'm also going an extra day or so between gas fillups.
3. Did it improve the performance?
- If we are talking any improved acceleration, I'd say I did not notice any changes.
- But it significantly improved my startup speed. This could either be attributed to not having any fuel pressure loss...as well as possibly the better atomization of the 4 ports. Psychologically, this fast starting makes me feel the engine is "healthier", if that makes any sense. Since I did not perform an A/B test with brand new 1port injectors vs brand new 4port injectors, it's difficult to answer if the improved startup speed is purely due to the injectors being new/clean or if the 4ports actually helped or not.
4. Anything else?
- It sounds a bit better. Seriously. It's a very minor change that you probably only notice after driving the same vehicle for 20yrs though. It's definitely not in the same league as the sound change with a different muffler.
- I'm glad I changed them. If anything, I feel better knowing that I now know how to change fuel injectors. Perhaps a bit of extra pride for a non-mechanic like me. I also like have "new" fuel injectors in as my TJ is technically over 20 years old now...and everything deteriorates over time. I also had an issue with 1 injectors (or o-ring) that has been fixed. Maybe I'm just happy that it actually started up the 1st time after I changed them.
5. Do I recommend them to others?
- uhmm...I'd give the suggestion of replacing the original 1port injectors with the 4port injectors IF/WHEN you need to replace one. Meaning, if you are buying a new fuel injector, I'd personally lean towards buying the 4port instead of another 1 port.
If you are expecting any "noticeable" improvement to your perfectly good 1port injectors, I think you are risking being disappointed.
The reality is, it's entirely possible I could have "fixed" my injector issue with a $2 o-ring replacement instead of replacing all the fuel injectors.
But I bought:
- peace of mind (new injectors all around)
- knowledge (how to replace injectors)
- experience/pride (I replaced them myself)
- scalability (maybe there is a turbo and a CPU reprogramming in my future, lol, ahem...)
- a performance upgrade that I'm going to say...probably works better than stickers.
